Subversion Repositories openrisc_2011-10-31

//==========================================================================

//

//      io/serial/arm/aeb_serial.c

//

//      ARM AEB-1 Serial I/O Interface Module (interrupt driven)

//

//==========================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

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// or inline functions from this file, or you compile this file and link it

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//####ECOSGPLCOPYRIGHTEND####

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):   gthomas

// Contributors:  gthomas

// Date:        1999-02-04

// Purpose:     AEB-1 Serial I/O module (interrupt driven version)

// Description: 

//

//####DESCRIPTIONEND####

//

//==========================================================================

#include <pkgconf/system.h>

#include <pkgconf/io_serial.h>

#include <pkgconf/io.h>

#include <cyg/io/io.h>

#include <cyg/hal/hal_intr.h>

#include <cyg/io/devtab.h>

#include <cyg/io/serial.h>

#include <cyg/infra/diag.h>

#ifdef CYGPKG_IO_SERIAL_ARM_AEB

#include "aeb_serial.h"

typedef struct aeb_serial_info {

    CYG_ADDRWORD   base;

    CYG_WORD       int_num;

    cyg_interrupt  serial_interrupt;

    cyg_handle_t   serial_interrupt_handle;

} aeb_serial_info;

static bool aeb_serial_init(struct cyg_devtab_entry *tab);

static bool aeb_serial_putc(serial_channel *chan, unsigned char c);

static Cyg_ErrNo aeb_serial_lookup(struct cyg_devtab_entry **tab,

                                   struct cyg_devtab_entry *sub_tab,

                                   const char *name);

static unsigned char aeb_serial_getc(serial_channel *chan);

static Cyg_ErrNo aeb_serial_set_config(serial_channel *chan,

                                       cyg_uint32 key,

                                       const void *xbuf, cyg_uint32 *len);

static void aeb_serial_start_xmit(serial_channel *chan);

static void aeb_serial_stop_xmit(serial_channel *chan);

static cyg_uint32 aeb_serial_ISR(cyg_vector_t vector, cyg_addrword_t data);

static void       aeb_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);

static SERIAL_FUNS(aeb_serial_funs,

                   aeb_serial_putc,

                   aeb_serial_getc,

                   aeb_serial_set_config,

                   aeb_serial_start_xmit,

                   aeb_serial_stop_xmit

    );

#ifdef CYGPKG_IO_SERIAL_ARM_AEB_SERIAL0

static aeb_serial_info aeb_serial_info0 = {0xFFFF0000,

                                           CYGNUM_HAL_INTERRUPT_UART0};

#if CYGNUM_IO_SERIAL_ARM_AEB_SERIAL0_BUFSIZE > 0

static unsigned char aeb_serial_out_buf0[CYGNUM_IO_SERIAL_ARM_AEB_SERIAL0_BUFSIZE];

static unsigned char aeb_serial_in_buf0[CYGNUM_IO_SERIAL_ARM_AEB_SERIAL0_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(aeb_serial_channel0,

                                       aeb_serial_funs,

                                       aeb_serial_info0,

                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_AEB_SERIAL0_BAUD),

                                       CYG_SERIAL_STOP_DEFAULT,

                                       CYG_SERIAL_PARITY_DEFAULT,

                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,

                                       CYG_SERIAL_FLAGS_DEFAULT,

                                       &aeb_serial_out_buf0[0], sizeof(aeb_serial_out_buf0),

                                       &aeb_serial_in_buf0[0], sizeof(aeb_serial_in_buf0)

    );

#else

static SERIAL_CHANNEL(aeb_serial_channel0,

                      aeb_serial_funs,

                      aeb_serial_info0,

                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_AEB_SERIAL0_BAUD),

                      CYG_SERIAL_STOP_DEFAULT,

                      CYG_SERIAL_PARITY_DEFAULT,

                      CYG_SERIAL_WORD_LENGTH_DEFAULT,

                      CYG_SERIAL_FLAGS_DEFAULT

    );

#endif

DEVTAB_ENTRY(aeb_serial_io0,

             CYGDAT_IO_SERIAL_ARM_AEB_SERIAL0_NAME,

             0,                     // Does not depend on a lower level interface

             &cyg_io_serial_devio,

             aeb_serial_init,

             aeb_serial_lookup,     // Serial driver may need initializing

             &aeb_serial_channel0

    );

#endif //  CYGPKG_IO_SERIAL_ARM_AEB_SERIAL0

#ifdef CYGPKG_IO_SERIAL_ARM_AEB_SERIAL1

static aeb_serial_info aeb_serial_info1 = {0xFFFF0400,

                                           CYGNUM_HAL_INTERRUPT_UART1};

#if CYGNUM_IO_SERIAL_ARM_AEB_SERIAL1_BUFSIZE > 0

static unsigned char aeb_serial_out_buf1[CYGNUM_IO_SERIAL_ARM_AEB_SERIAL1_BUFSIZE];

static unsigned char aeb_serial_in_buf1[CYGNUM_IO_SERIAL_ARM_AEB_SERIAL1_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(aeb_serial_channel1,

                                       aeb_serial_funs,

                                       aeb_serial_info1,

                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_AEB_SERIAL1_BAUD),

                                       CYG_SERIAL_STOP_DEFAULT,

                                       CYG_SERIAL_PARITY_DEFAULT,

                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,

                                       CYG_SERIAL_FLAGS_DEFAULT,

                                       &aeb_serial_out_buf1[0], sizeof(aeb_serial_out_buf1),

                                       &aeb_serial_in_buf1[0], sizeof(aeb_serial_in_buf1)

    );

#else

static SERIAL_CHANNEL(aeb_serial_channel1,

                      aeb_serial_funs,

                      aeb_serial_info1,

                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_AEB_SERIAL1_BAUD),

                      CYG_SERIAL_STOP_DEFAULT,

                      CYG_SERIAL_PARITY_DEFAULT,

                      CYG_SERIAL_WORD_LENGTH_DEFAULT,

                      CYG_SERIAL_FLAGS_DEFAULT

    );

#endif

DEVTAB_ENTRY(aeb_serial_io1,

             CYGDAT_IO_SERIAL_ARM_AEB_SERIAL1_NAME,

             0,                     // Does not depend on a lower level interface

             &cyg_io_serial_devio,

             aeb_serial_init,

             aeb_serial_lookup,     // Serial driver may need initializing

             &aeb_serial_channel1

    );

#endif //  CYGPKG_IO_SERIAL_ARM_AEB_SERIAL1

// Internal function to actually configure the hardware to desired baud rate, etc.

static bool

aeb_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init)

{

    aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv;

    volatile struct serial_port *port = (volatile struct serial_port *)aeb_chan->base;

    unsigned short baud_divisor = select_baud[new_config->baud];

    unsigned char _lcr, _ier;

    if (baud_divisor == 0) return false;

    _ier = port->REG_IER;

    port->REG_IER = 0;  // Disable port interrupts while changing hardware

    _lcr = select_word_length[new_config->word_length - CYGNUM_SERIAL_WORD_LENGTH_5] |

        select_stop_bits[new_config->stop] |

        select_parity[new_config->parity];

    port->REG_LCR = _lcr;

    port->REG_LCR |= LCR_DL;

    port->REG_MDL = baud_divisor >> 8;

    port->REG_LDL = baud_divisor & 0xFF;

    port->REG_LCR &= ~LCR_DL;

    if (init) {

        port->REG_FCR = 0x07;  // Enable and clear FIFO

        if (chan->out_cbuf.len != 0) {

            port->REG_IER = IER_RCV;

        } else {

            port->REG_IER = 0;

        }

        port->REG_MCR = MCR_INT|MCR_DTR|MCR_RTS;  // Master interrupt enable

    } else {

        port->REG_IER = _ier;

    }

    if (new_config != &chan->config) {

        chan->config = *new_config;

    }

    return true;

}

// Function to initialize the device.  Called at bootstrap time.

static bool

aeb_serial_init(struct cyg_devtab_entry *tab)

{

    serial_channel *chan = (serial_channel *)tab->priv;

    aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv;

#ifdef CYGDBG_IO_INIT

    diag_printf("AEB SERIAL init - dev: %x.%d\n", aeb_chan->base, aeb_chan->int_num);

#endif

    (chan->callbacks->serial_init)(chan);  // Really only required for interrupt driven devices

    if (chan->out_cbuf.len != 0) {

        cyg_drv_interrupt_create(aeb_chan->int_num,

                                 99,                     // Priority - unused

                                 (cyg_addrword_t)chan,   //  Data item passed to interrupt handler

                                 aeb_serial_ISR,

                                 aeb_serial_DSR,

                                 &aeb_chan->serial_interrupt_handle,

                                 &aeb_chan->serial_interrupt);

        cyg_drv_interrupt_attach(aeb_chan->serial_interrupt_handle);

        cyg_drv_interrupt_unmask(aeb_chan->int_num);

    }

    aeb_serial_config_port(chan, &chan->config, true);

    return true;

}

// This routine is called when the device is "looked" up (i.e. attached)

static Cyg_ErrNo

aeb_serial_lookup(struct cyg_devtab_entry **tab,

                  struct cyg_devtab_entry *sub_tab,

                  const char *name)

{

    serial_channel *chan = (serial_channel *)(*tab)->priv;

    (chan->callbacks->serial_init)(chan);  // Really only required for interrupt driven devices

    return ENOERR;

}

// Send a character to the device output buffer.

// Return 'true' if character is sent to device

static bool

aeb_serial_putc(serial_channel *chan, unsigned char c)

{

    aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv;

    volatile struct serial_port *port = (volatile struct serial_port *)aeb_chan->base;

    if (port->REG_LSR & LSR_THE) {

// Transmit buffer is empty

        port->REG_THR = c;

        return true;

    } else {

// No space

        return false;

    }

}

// Fetch a character from the device input buffer, waiting if necessary

static unsigned char

aeb_serial_getc(serial_channel *chan)

{

    unsigned char c;

    aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv;

    volatile struct serial_port *port = (volatile struct serial_port *)aeb_chan->base;

    while ((port->REG_LSR & LSR_RSR) == 0) ;   // Wait for char

    c = port->REG_RHR;

    return c;

}

// Set up the device characteristics; baud rate, etc.

static Cyg_ErrNo

aeb_serial_set_config(serial_channel *chan, cyg_uint32 key,

                      const void *xbuf, cyg_uint32 *len)

{

    switch (key) {

    case CYG_IO_SET_CONFIG_SERIAL_INFO:

      {

        cyg_serial_info_t *config = (cyg_serial_info_t *)xbuf;

        if ( *len < sizeof(cyg_serial_info_t) ) {

            return -EINVAL;

        }

        *len = sizeof(cyg_serial_info_t);

        if ( true != aeb_serial_config_port(chan, config, false) )

            return -EINVAL;

      }

      break;

    default:

        return -EINVAL;

    }

    return ENOERR;

}

// Enable the transmitter on the device

static void

aeb_serial_start_xmit(serial_channel *chan)

{

    aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv;

    volatile struct serial_port *port = (volatile struct serial_port *)aeb_chan->base;

    port->REG_IER |= IER_XMT;  // Enable xmit interrupt

}

// Disable the transmitter on the device

static void

aeb_serial_stop_xmit(serial_channel *chan)

{

    aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv;

    volatile struct serial_port *port = (volatile struct serial_port *)aeb_chan->base;

    port->REG_IER &= ~IER_XMT;  // Disable xmit interrupt

}

// Serial I/O - low level interrupt handler (ISR)

static cyg_uint32

aeb_serial_ISR(cyg_vector_t vector, cyg_addrword_t data)

{

    serial_channel *chan = (serial_channel *)data;

    aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv;

    cyg_drv_interrupt_mask(aeb_chan->int_num);

    cyg_drv_interrupt_acknowledge(aeb_chan->int_num);

    return CYG_ISR_CALL_DSR;  // Cause DSR to be run

}

// Serial I/O - high level interrupt handler (DSR)

static void

aeb_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data)

{

    serial_channel *chan = (serial_channel *)data;

    aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv;

    volatile struct serial_port *port = (volatile struct serial_port *)aeb_chan->base;

    unsigned char isr;

    isr = port->REG_ISR & 0x0E;

    if (isr == ISR_Tx) {

        (chan->callbacks->xmt_char)(chan);

    } else if (isr == ISR_Rx) {

        (chan->callbacks->rcv_char)(chan, port->REG_RHR);

    }

    cyg_drv_interrupt_unmask(aeb_chan->int_num);

}

#endif